A description is provided of the cavity-nests of Isodontia elegans (Smith), one of three North American members of the subgenus Murrayella. As is typical of its close relatives and of other populations of the same species, females constructed multi-cellular nests in tunnels (trap-nests in this case) and separated cells with 2–20 cm thick partitions consisting of finely cut, dried plant fragments. Cells, up to five per nest, were stocked solely with tree crickets (Oecanthus quadripunctatus), 97% of which were adults, primarily females. From 3 to 11 prey were placed in individual brood cells, with female offspring receiving, on average, 40% more prey than males.
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